Mowing machine



May 4,1926. 1,583,167

0, PEHRSQN MOWING MACHINE I Filed Dec. 26, 1924 2 Sheets-Sheet 1 0193173070 1km Y7 May 4 1926.

o. PEHRSON ubwme MACHINE Filed Dacj. 26, 1924 2 Sheets-Sheet 2 Z; vnz w"010 Blrzmn Patented May 4,1926.v i

UNITED STATES OLOF rnrmsolv, or: EALUN, SWEDEN.

MowINe MACHINE.

Application filed December 26, 1924. Serial No. 758,227. i

useful Improvements in Mowing Machines,

of which the following is a specification.

The present invention relates to improve'- ments in mowing machines, andmore particularly inthe means or devices employed to exert pressure onthe knives and thereby avoid the objectionable play between the latterand the stationary cutter plate which would ordinarily occur as a resultof wear.

According to the invention, a speciallyconstructed-presser or bearingdevice is provided,'which bears at its front end upon the upper face ofthe knives and is equipped at its rear end with a, projection whichengages not only the under face of the knives but also the adjacent edgeface of the knife-bar, thus supporting the knives firmly: at the threepoints where they are ,mostliable to become worn; the aforesaid devicebeingso mounted as to be capable of an adjusting movement to vary itsposition in a manner to compensate for the wear as it occurs.

In the accompanying drawings:

Figure 1 is atransverse vertical sectional view showing one embodimentof-the invention, the section being taken on line 11 of Fig. 2;

' Fig. 2 is a plan view; I I Fig. 3 is a longitudinal section taken online 3-3, Fig. 2;

. Fig. 4 is a side elevation of the improved presser member andassociated knife;

Fig. 5 is a longitudinal section of a slightly modified form of pressermember; a Fig. 6 is a side elevation of a further modified pressermember.

Referring to Figs. 1-4, 1 indicates the knives of the machine, which arefixed to the reciprocating knife-bar 5, and 2 the station ary cutterplate or sole for cooperation therewith. The plate or sole Qis secured,as usual, to the fingers 7 which, in turn, are fastened tothe finger-bar4;; the parts thus far described being of "any "suitable construction.

To exert the desired pressure on the knives, andto adjust such pressureto compensate for wear,I provide a device which, in the form representedin the figures mentioned, comprises a fixed part 8 and a movable pa-rt9. Both parts, as shown, are substantially of conveXo-concave or'"dishedconstruction and overlie each other; .the fixed part 8 being bolted, orotherwise rigidly attached to the finger-bar 1 (Fig. 2) The part .9 fitsover the fixed part 8 and is slidable upon the same in an endwise orlongitu:

the upper surface of the knifeor knives, As Wlll be understood, anysuitable number of these resser devlces may be provided, ar-

PATENT OFFICE. r

v dinal direction, itslfront end bearing upjon range at intervals alongthe finger-bar; and they are .so positioned that the front end,ofthe'upp'er or. movable part 9 of each device presses either upon thefacesof two adacent knives, as 1n the construction illustrated, or uponthe face of one knife only, in which latter event there will be apresser device individual to each knife. The curvatures of the surfacesof the two, parts are such that the imaginary centers iofcurvature liebelow the knives, aswill beapparent a from Fig. :1. Y 7

,The rear end of the movable part 9 of the device is widened andforms apair of spaced projections at opposite sides thereof which are indicatedat 10. These projections 10 extend immediatelyben'eath the rear portions6 of the knives 1, the under faces of which rest thereon and are thussupported, while the front edge faces of said projections bear directlyagainst the rear edge face of the knife-bar 5, as shown in'Fig. 1.' Dueto this arrangement and tothe usualslight forward and downwardinclination of the knife-bar and the knives, it will be apparent,therefore, that a forward movement of the adjustable part 9 will resultin an increased pressure being exerted upon the bar and knives at'thethree'points where said part or member 9 engages the same,viz the uppersurface of the knives intermediate their ends, the'under surface of therear porti-ons thereof, and the rear edge face of the bar; and suchpressure will; thus compensate for any wear'and will prevent the playwhich would otherwise be caused.

To effect this vadjustment, there is. provided, in the constructionillustrated, a screw 13 which is'rotatably'engaged in a-threaded hole orpassage formed'throu'gh a lug .16 on the rear end of part9, the pointedend of the screw engaging the concave surface 17 of a coacting lug 14 onthe rear end ofithe fixedpart or member 8,,so that;when said screw isrotated in the proper direction, the part9 will be forced forward. Thelatter is preferably guided in its movement by a pin 12 which isthreaded into a socket 18 formed in the forward portion of the fixedpart 8, the head of the pin projecting through a longitudinal slot 11 inthe part 9.

In the construction above described, the movable part or member of thepresser device overlies the fixed part; but such arrangement may bereversed, if desired, and the movable part positioned beneath the fixedpart, as represented in Fig. 5, the construction and operation otherwisebeing the same. In Fig. 5, the. fixed and movable members arerespectively designated 8 and 9, the projections on the latter part at10 (only one appears), and the guide slot and pin at 11 and 12'.

Whilethe presser device preferably embodies two 'co-acting parts ormembers, as above explained, it may consist solely of the movable part,according to the further modification represented in Fig. 6. In thisform of the invention, the single member 9 is provided intermediate itsends with a depending eye 155 which is loosely mounted ,on an axle orpivot 15, suitably connected to the finger-bar 4, so that said member isthus enabled to swing or rock about such pivot as an axis. A set-screw19 passes through an apertured lug 20 on the rear portion of member 9and bears against the finger-bar to effect the required adjustment. Apair of bearing projections 10 which act in the same manner as theprojections 10 and 10 previously described, is provided, only oneprojection 10 appearing.

I claim as my invention 1. In a mowing machine, the combination of afinger-bar, fingers secured thereto, a knife-bar, knife means carried bythe latter bar, and means for imposing pressure upon the knife means andthe knife-bar; said presser means embodying a movable member supportedby the finger-bar and bearing at its front-end directly upon the upperface of the knife means, a projection on said member bearing directlyagainst the under face of the rear portion of the knife means and alsodirectly against the rear edge face i of the knife bar, and adjustingmeans for varying the position of said member and thereby the pressureexerted by its said front end and projection.

2. In a mowing-machine, the'combination of a finger-bar, fingers securedthereto, a knife-bar, knife means carried by the latter bar, and meansfor imposing pressure upon the knife means and the knife bar; saidpresser means embodying a movable member supported by the finger bar anddirectly engaging said bar and knife means at three different points,viz: against the upper face of the knife means, against the under faceof the rear portion of said knife means, and against the rear edge faceof the knifebar, and also embodying adjusting means for varying theposition of said member and thereby the pressure exerted by it at suchpoints. 7

3. In a mowing machine, the combination of a finger-bar, fingers securedthereto, a knife-bar, knife means carried by the latter bar, and meansfor imposing pressure upon the knife means and the knife-bar; saidpresser means embodying a movable member supported by the finger-bar andbearing at its front end directly upon theupper face of the knife means,a pair of depending,

of a finger-bar; fingers secured thereto; a 1 I knife-bar; knife meanscarried by the latter bar; and a device for imposing pressure upon theknife means and its'bar, comprising a fixed member; a movable memberslidably engaged with the fixed member and bearing directly against theknife-bar and knife means at three different points, viz:

against the upper face of the knife means, 3

against the lower face of said knife means, and against the knife-bar,and means for adjusting the position of the movable member relative tothe fixedmember and thereby the pressure which-said movable memberexerts at saidthree points;

5. A mowing machine, according to claim 4, in which the movable member.exerts pressure at its front end upon the upper face I of the knifemeans, and at its rear portion against the underface of the rear portionof the knife means and the rear edge face of the knife-bar. a f

6. A mowingvmachine, according to claim 4, in which the fixed andmovable members are of 'convexo-concave form and are interfitted. i

7 A mowing machine, according to claim 4, in which the fixed and movablemembers are of convexo-concave form and are interfitted, the imaginarycenters of curvature of said members being located below the knifebar.and knife means. a

8. A mowing machine, according to claim 4, in which the fixed andmovable members are of convexo-concave form and are interfitted; and inwhich the movable member bears at its front end upon the upper face ofthe knife means and is provided with a projection that engages both theunder face of the rear portion of the knife means and the rear edge faceof the knifebar.

9. A mowing machine, according to claim 4, in which the adjusting meanscomprises a set-screw rotatably mounted in a lug on one of the twomembers and hearing at one end against a lug on the other member.

10. A mowing machine, according to claim 4, in which the fixed andmovable members-are of conveXo-concave form and are interfitted; and inwhich the adjusting means comprises a set-screw rotatabiy mounted inalug on one of the two members and bearing at one end against a lug onthe other member.

11. A mowing machine, according to claim 4, in which the fixed andmovable members are of convexo-concave form and are interfitted; and inwhich the movable member bears at its front end upon the upper face ofthe knife means and is provided with a projection that engages boththeunder face of the rear portion of the knife means and the rear edgeface of the knifebar; the adjusting means comprising a set-. screwrotatably mounted in a lug on one of the two members and bearing at oneend against a lug on the other member.

In testimony whereof I have hereunto set my name at Falun thiseighteenth day of November, 1924.

OLOF PEHRSON.

